Error: Module Not Defined in Python

Updated: August 2, 2026

You may encounter warnings like:

"ChromePdfRenderer" is not defined
"PdfCssMediaType" is not defined
"FitToPaperModes" is not defined

The above warnings can be ignored. Since IronPDF for Python utilizes IronPDF C#, these features are implemented in .NET 6.0. As a result, the relevant class definitions might not be directly viewable or defined within the Python environment.

Below is an example of how you might encounter and handle such a situation in Python when using the IronPDF library.

# Importing the IronPDF module. This is assumed to be a hypothetical Python wrapper for IronPDF C&num; library.
# In practice, you might use a Python package manager to install and import the necessary module.
from ironpdf import ChromePdfRenderer, PdfCssMediaType, FitToPaperModes

# Example function using IronPDF components to illustrate usage
def generate_pdf():
    try:
        # Create a new PDF renderer
        renderer = ChromePdfRenderer()
        
        # Define options or configurations for the renderer
        renderer.css_media_type = PdfCssMediaType.PRINT
        renderer.fit_to_paper_mode = FitToPaperModes.FIT
        
        # Assume we have HTML content to convert to PDF
        html_content = "<h1>Hello, World!</h1>"

        # Render the HTML content to PDF
        pdf_document = renderer.render_html_as_pdf(html_content)

        # Save the PDF document to a file
        pdf_document.save_as("output.pdf")

    except Exception as e:
        # Log and handle any exceptions that occur during PDF generation
        print(f"An error occurred: {e}")

# Execute the function to generate a PDF
generate_pdf()

# Importing the IronPDF module. This is assumed to be a hypothetical Python wrapper for IronPDF C&num; library.
# In practice, you might use a Python package manager to install and import the necessary module.
from ironpdf import ChromePdfRenderer, PdfCssMediaType, FitToPaperModes

# Example function using IronPDF components to illustrate usage
def generate_pdf():
    try:
        # Create a new PDF renderer
        renderer = ChromePdfRenderer()
        
        # Define options or configurations for the renderer
        renderer.css_media_type = PdfCssMediaType.PRINT
        renderer.fit_to_paper_mode = FitToPaperModes.FIT
        
        # Assume we have HTML content to convert to PDF
        html_content = "<h1>Hello, World!</h1>"

        # Render the HTML content to PDF
        pdf_document = renderer.render_html_as_pdf(html_content)

        # Save the PDF document to a file
        pdf_document.save_as("output.pdf")

    except Exception as e:
        # Log and handle any exceptions that occur during PDF generation
        print(f"An error occurred: {e}")

# Execute the function to generate a PDF
generate_pdf()

Python

Explanation:

Import Statements: The code assumes the existence of a Python wrapper or module for IronPDF (ironpdf). Real-world implementation would require the actual module installation via a package manager.
Error Handling: The function generate_pdf() is equipped with a try-except block to catch and handle exceptions that may occur due to undefined classes in Python.
PDF Rendering: The use of ChromePdfRenderer and other classes illustrates how you would typically set options and render PDF documents if the Python interface were accessible.

Note: The provided code is hypothetical and intended for illustrative purposes, assuming the existence of a Python wrapper for IronPDF. Actual implementation details may vary based on library support and integration with .NET components.

Curtis Chau

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Technical Writer

Curtis Chau holds a Bachelor’s degree in Computer Science (Carleton University) and specializes in front-end development with expertise in Node.js, TypeScript, JavaScript, and React. Passionate about crafting intuitive and aesthetically pleasing user interfaces, Curtis enjoys working with modern frameworks and creating well-structured, visually appealing manuals.

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